/*
 * Copyright 2019. Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.android.apps.santatracker.dasherdancer

import android.os.AsyncTask
import com.google.android.apps.santatracker.util.SantaLog

/** Async task that supports a full retry operation.  */
abstract class RetryableAsyncTask<A, B, C> : AsyncTask<A, B, C>() {

    internal abstract fun shouldRetry(): Boolean

    internal abstract fun onPrepareForRetry()

    internal fun retrySelf(params: Array<A>): C? {
        return if (shouldRetry()) {
            onPrepareForRetry()
            doInBackground(*params)
        } else {
            SantaLog.d(TAG, "Should not retry, canceling task")

            cancel(true)
            null
        }
    }

    companion object {

        private const val TAG = "RetryableAT"
    }
}
